models.md Codex Docs, 2026-02-21 00:33 UTC → 2026-05-07 20:02 UTC

2 2 

3## Recommended models3## Recommended models

4 4 

5![gpt-5.3-codex](/images/codex/codex-wallpaper-1.webp)5<div class="not-prose grid gap-6 md:grid-cols-2 xl:grid-cols-3">

6 6 <ModelDetails

7gpt-5.3-codex7 client:load

8 8 name="gpt-5.5"

9Most capable agentic coding model to date, combining frontier coding performance with stronger reasoning and professional knowledge capabilities.9 slug="gpt-5.5"

10 10 wallpaperUrl="/images/api/models/gpt-5.5.jpg"

11codex -m gpt-5.3-codex11 description="OpenAI's newest frontier model for complex coding, computer use, knowledge work, and research workflows in Codex."

12 12 data={{

13Copy command13 features: [

14 14 {

15Capability15 title: "Capability",

16 16 value: "",

17Speed17 icons: [

18 18 "openai.SparklesFilled",

19Codex CLI & SDK19 "openai.SparklesFilled",

20 20 "openai.SparklesFilled",

21Codex app & IDE extension21 "openai.SparklesFilled",

22 22 "openai.SparklesFilled",

23Codex Cloud23 ],

24 24 },

25ChatGPT Credits25 {

26 26 title: "Speed",

27API Access27 value: "",

28 28 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

29![gpt-5.3-codex-spark](/images/codex/codex-wallpaper-2.webp)29 },

30 30 {

31gpt-5.3-codex-spark31 title: "Codex CLI & SDK",

32 32 value: true,

33Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users.33 },

34 34 { title: "Codex app & IDE extension", value: true },

35codex -m gpt-5.3-codex-spark35 {

36 36 title: "Codex Cloud",

37Copy command37 value: false,

38 38 },

39Capability39 { title: "ChatGPT Credits", value: true },

40 40 { title: "API Access", value: false },

41Speed41 ],

42 42 }}

43Codex CLI & SDK43 />

44 44 

45Codex app & IDE extension45<ModelDetails

46 46 client:load

47Codex Cloud47 name="gpt-5.4"

48 48 slug="gpt-5.4"

49ChatGPT Credits49 wallpaperUrl="/images/api/models/gpt-5.4.jpg"

50 50 description="Flagship frontier model for professional work that brings the industry-leading coding capabilities of GPT-5.3-Codex together with stronger reasoning, tool use, and agentic workflows."

51API Access51 data={{

52 52 features: [

53![gpt-5.2-codex](/images/codex/gpt-5.2-codex.png)53 {

54 54 title: "Capability",

55gpt-5.2-codex55 value: "",

56 56 icons: [

57Advanced coding model for real-world engineering. Succeeded by GPT-5.3-Codex.57 "openai.SparklesFilled",

58 58 "openai.SparklesFilled",

59codex -m gpt-5.2-codex59 "openai.SparklesFilled",

60 60 "openai.SparklesFilled",

61Copy command61 "openai.SparklesFilled",

62 62 ],

63Capability63 },

64 64 {

65Speed65 title: "Speed",

66 66 value: "",

67Codex CLI & SDK67 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

68 68 },

69Codex app & IDE extension69 {

70 70 title: "Codex CLI & SDK",

71Codex Cloud71 value: true,

72 72 },

73ChatGPT Credits73 { title: "Codex app & IDE extension", value: true },

74 74 {

75API Access75 title: "Codex Cloud",

76 76 value: false,

77For most coding tasks in Codex, start with gpt-5.3-codex. It is available for77 },

78ChatGPT-authenticated Codex sessions in the Codex app, CLI, IDE extension, and78 { title: "ChatGPT Credits", value: true },

79Codex Cloud. API access for GPT-5.3-Codex will come soon. The79 { title: "API Access", value: true },

80gpt-5.3-codex-spark model is available in research preview for ChatGPT Pro80 ],

81subscribers.81 }}

82/>

83 

84<ModelDetails

85 client:load

86 name="gpt-5.4-mini"

87 slug="gpt-5.4-mini"

88 wallpaperUrl="/images/api/models/gpt-5-mini.jpg"

89 description="Fast, efficient mini model for responsive coding tasks and subagents."

90 data={{

91 features: [

92 {

93 title: "Capability",

94 value: "",

95 icons: [

96 "openai.SparklesFilled",

97 "openai.SparklesFilled",

98 "openai.SparklesFilled",

99 ],

100 },

101 {

102 title: "Speed",

103 value: "",

104 icons: ["openai.Flash", "openai.Flash", "openai.Flash", "openai.Flash"],

105 },

106 {

107 title: "Codex CLI & SDK",

108 value: true,

109 },

110 { title: "Codex app & IDE extension", value: true },

111 {

112 title: "Codex Cloud",

113 value: false,

114 },

115 { title: "ChatGPT Credits", value: true },

116 { title: "API Access", value: true },

117 ],

118 }}

119/>

120 

121<ModelDetails

122 client:load

123 name="gpt-5.3-codex"

124 slug="gpt-5.3-codex"

125 wallpaperUrl="/images/codex/codex-wallpaper-1.webp"

126 description="Industry-leading coding model for complex software engineering. Its coding capabilities now also power GPT-5.4."

127 data={{

128 features: [

129 {

130 title: "Capability",

131 value: "",

132 icons: [

133 "openai.SparklesFilled",

134 "openai.SparklesFilled",

135 "openai.SparklesFilled",

136 "openai.SparklesFilled",

137 "openai.SparklesFilled",

138 ],

139 },

140 {

141 title: "Speed",

142 value: "",

143 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

144 },

145 {

146 title: "Codex CLI & SDK",

147 value: true,

148 },

149 { title: "Codex app & IDE extension", value: true },

150 {

151 title: "Codex Cloud",

152 value: true,

153 },

154 { title: "ChatGPT Credits", value: true },

155 { title: "API Access", value: true },

156 ],

157 }}

158/>

159 

160<ModelDetails

161 client:load

162 name="gpt-5.3-codex-spark"

163 slug="gpt-5.3-codex-spark"

164 wallpaperUrl="/images/codex/codex-wallpaper-2.webp"

165 description="Text-only research preview model optimized for near-instant, real-time coding iteration. Available to ChatGPT Pro users."

166 data={{

167 features: [

168 {

169 title: "Capability",

170 value: "",

171 icons: [

172 "openai.SparklesFilled",

173 "openai.SparklesFilled",

174 "openai.SparklesFilled",

175 ],

176 },

177 {

178 title: "Speed",

179 value: "",

180 icons: [

181 "openai.Flash",

182 "openai.Flash",

183 "openai.Flash",

184 "openai.Flash",

185 "openai.Flash",

186 ],

187 },

188 {

189 title: "Codex CLI & SDK",

190 value: true,

191 },

192 { title: "Codex app & IDE extension", value: true },

193 {

194 title: "Codex Cloud",

195 value: false,

196 },

197 { title: "ChatGPT Credits", value: false },

198 { title: "API Access", value: false },

199 ],

200 }}

201/>

202 

203</div>

204 

205For most tasks in Codex, start with `gpt-5.5` when it appears in your model

206 picker. It is strongest for complex coding, computer use, knowledge work, and

207 research workflows. GPT-5.5 is currently available in Codex when you sign in

208 with ChatGPT; it isn't available with API-key authentication. During the

209 rollout, continue using `gpt-5.4` if `gpt-5.5` is not yet available. Use

210 `gpt-5.4-mini` when you want a faster, lower-cost option for lighter coding

211 tasks or subagents. The `gpt-5.3-codex-spark` model is available in research

212 preview for ChatGPT Pro subscribers and is optimized for near-instant,

213 real-time coding iteration.

82 214 

83## Alternative models215## Alternative models

84 216 

85![gpt-5.2](/images/api/models/gpt-5.2.jpg)217<div class="not-prose grid gap-4 md:grid-cols-2 xl:grid-cols-3">

86 218<ModelDetails

87gpt-5.2219 client:load

88 220 name="gpt-5.2"

89Our best general agentic model for tasks across industries and domains.221 slug="gpt-5.2"

90 222 description="Previous general-purpose model for coding and agentic tasks, including hard debugging tasks that benefit from deeper deliberation."

91codex -m gpt-5.2223 collapsible

92 224 data={{

93Copy command225 features: [

94 226 {

95Show details227 title: "Capability",

96 228 value: "",

97![gpt-5.1-codex-max](/images/api/models/gpt-5.1-codex-max.jpg)229 icons: [

98 230 "openai.SparklesFilled",

99gpt-5.1-codex-max231 "openai.SparklesFilled",

100 232 "openai.SparklesFilled",

101Optimized for long-horizon, agentic coding tasks in Codex.233 "openai.SparklesFilled",

102 234 ],

103codex -m gpt-5.1-codex-max235 },

104 236 {

105Copy command237 title: "Speed",

106 238 value: "",

107Show details239 icons: ["openai.Flash", "openai.Flash", "openai.Flash"],

108 240 },

109![gpt-5.1](/images/api/models/gpt-5.1.jpg)241 {

110 242 title: "Codex CLI & SDK",

111gpt-5.1243 value: true,

112 244 },

113Great for coding and agentic tasks across domains. Succeeded by GPT-5.2.245 { title: "Codex app & IDE extension", value: true },

114 246 {

115codex -m gpt-5.1247 title: "Codex Cloud",

116 248 value: false,

117Copy command249 },

118 250 { title: "ChatGPT Credits", value: true },

119Show details251 { title: "API Access", value: true },

120 252 ],

121![gpt-5.1-codex](/images/api/models/gpt-5.1-codex.jpg)253 }}

122 254/>

123gpt-5.1-codex255 

124 256 </div>

125Optimized for long-running, agentic coding tasks in Codex. Succeeded by GPT-5.1-Codex-Max.

126 

127codex -m gpt-5.1-codex

128 

129Copy command

130 

131Show details

132 

133![gpt-5-codex](/images/api/models/gpt-5-codex.jpg)

134 

135gpt-5-codex

136 

137Version of GPT-5 tuned for long-running, agentic coding tasks. Succeeded by GPT-5.1-Codex.

138 

139codex -m gpt-5-codex

140 

141Copy command

142 

143Show details

144 

145![gpt-5-codex-mini](/images/api/models/gpt-5-codex.jpg)

146 

147gpt-5-codex-mini

148 

149Smaller, more cost-effective version of GPT-5-Codex. Succeeded by GPT-5.1-Codex-Mini.

150 

151codex -m gpt-5-codex

152 

153Copy command

154 

155Show details

156 

157![gpt-5](/images/api/models/gpt-5.jpg)

158 

159gpt-5

160 

161Reasoning model for coding and agentic tasks across domains. Succeeded by GPT-5.1.

162 

163codex -m gpt-5

164 

165Copy command

166 

167Show details

168 257 

169## Other models258## Other models

170 259 

171Codex works best with the models listed above.260When you sign in with ChatGPT, Codex works best with the models listed above.

172 261 

173You can also point Codex at any model and provider that supports either the [Chat Completions](https://platform.openai.com/docs/api-reference/chat) or [Responses APIs](https://platform.openai.com/docs/api-reference/responses) to fit your specific use case.262You can also point Codex at any model and provider that supports either the [Chat Completions](https://platform.openai.com/docs/api-reference/chat) or [Responses APIs](https://platform.openai.com/docs/api-reference/responses) to fit your specific use case.

174 263 

181 270 

182The Codex CLI and IDE extension use the same `config.toml` [configuration file](https://developers.openai.com/codex/config-basic). To specify a model, add a `model` entry to your configuration file. If you don't specify a model, the Codex app, CLI, or IDE Extension defaults to a recommended model.271The Codex CLI and IDE extension use the same `config.toml` [configuration file](https://developers.openai.com/codex/config-basic). To specify a model, add a `model` entry to your configuration file. If you don't specify a model, the Codex app, CLI, or IDE Extension defaults to a recommended model.

183 272 

273```toml

274model = "gpt-5.5"

184```275```

185model = "gpt-5.2"276 

186```277If `gpt-5.5` isn't available in your account yet, use `gpt-5.4`.

187 278 

188### Choosing a different local model temporarily279### Choosing a different local model temporarily

189 280 

192To start a new Codex CLI thread with a specific model or to specify the model for `codex exec` you can use the `--model`/`-m` flag:283To start a new Codex CLI thread with a specific model or to specify the model for `codex exec` you can use the `--model`/`-m` flag:

193 284 

194```bash285```bash

195codex -m gpt-5.3-codex286codex -m gpt-5.5

196```287```

197 288 

198### Choosing your model for cloud tasks289### Choosing your model for cloud tasks